Mike Coslo wrote:
. . .
I gotta get
these two meters calibrated against each other.
. . .

If you don't have a signal generator with variable output, connect the
two feedlines through a DPDT switch so it swaps the antenna to each
receiver when you switch it back and forth. Write down the meter reading
on each receiver for the same signal from the same antenna. It probably
won't take long to accumulate a decent cross reference.

Of course, you still won't have a clue as to how many dB each meter unit
represents. That'll take an investment of a few dollars and an evening
to make a step attenuator.

Roy Lewallen, W7EL